By the looks of it, you're trying to use an existing topology that was originally developed on Linux. In that topology, traffic capture was enabled and saved in a particular path, but now that you're on Windows, this path is no longer applicable.

Try to create a new topology from scratch, and see if you can enable traffic capture with it.

You cannot capture on IOU because it runs inside a VM, therefore the GNS3 GUI cannot access the capture file.

Isn't there a way to make the capturing happen on the host system?

Or maybe somehow "mirror" the capture on the host... Like, make it store the capture inside of an SMB shared folder (assuming IOU has such support... I haven't used it to know...), and make the host access the shared folder... Would that work?

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